I've had my Dinc for about 6 months or more now and I might be ready to try a new ROM. Do I have to be rooted in order to flash any kind of ROM?
Droid Does Incredible things
I've seen other people recommend you export your contacts via Verizon's site to a csv file then import them into google. You can export the contacts also right to the SD card, you'd need to back up your MIUI install, restore your previous rom, back up your contacts by going into People, Menu, Export to SD Card then restore your MIUI install and try importing them back.